The child can play more than doing maths. Plus the questions took too long to up a level even when it became clear the he's mastered similar type of questions. No control given to the parents to set the level or what to focus. That means if your child hasn't played it for a while, the child has to go through a long series of tests to reach his updated level. It can be very boring in that sense and feels a bit waste of time. Also the child could go free to any area of the play/practice zones, which makes it nearly impossible to ensure the child focus on improving the weakest knowledge points unless you supervise him all the way through! All in all, comparing with another program we signed up, with a busy schedule everyday, I don't think this maximised the ratio of efforts/time/benefit.